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Quantizer.hpp

00001 /* This file is part of Raul.
00002  * Copyright (C) 2007-2009 David Robillard <http://drobilla.net>
00003  *
00004  * Raul is free software; you can redistribute it and/or modify it under the
00005  * terms of the GNU General Public License as published by the Free Software
00006  * Foundation; either version 2 of the License, or (at your option) any later
00007  * version.
00008  *
00009  * Raul is distributed in the hope that it will be useful, but WITHOUT ANY
00010  * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
00011  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
00012  *
00013  * You should have received a copy of the GNU General Public License along
00014  * with this program; if not, write to the Free Software Foundation, Inc.,
00015  * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
00016  */
00017 
00018 #ifndef RAUL_QUANTIZER_HPP
00019 #define RAUL_QUANTIZER_HPP
00020 
00021 #include <cmath>
00022 #include "raul/TimeStamp.hpp"
00023 
00024 namespace Raul {
00025 
00026 
00027 class Quantizer {
00028 public:
00029     inline static TimeStamp quantize(TimeStamp q, TimeStamp t) {
00030         assert(q.unit() == t.unit());
00031         // FIXME: Precision problem?  Should probably stay in discrete domain
00032         const double qd = q.to_double();
00033         const double td = t.to_double();
00034         return TimeStamp(t.unit(), (qd > 0) ? lrint(td / qd) * qd : td);
00035     }
00036 
00037     inline static double quantize(double q, double t) {
00038         return (q > 0)
00039             ? lrint(t / q) * q
00040             : t;
00041     }
00042 };
00043 
00044 
00045 } // namespace Raul
00046 
00047 #endif // RAUL_QUANTIZER_HPP

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